Generated 3D LUT deviated from grading

I created a 3D LUT (one node, just curve manipuliations in each channel) from a grade in Resolve 12.5 (.cube), imported this LUT file and applied it to the same clip without any grading.
One should expect that the clip looks the same either way, but it doesn’t. With the LUT applied the image shows a shift towards green/cyan (lower screenshot) compared towards that graded clip and I wonder why that is (upper screenshot).
I tested this because I would like to use a LUT created in Resolve with an Odyssey Q7 monitor, but the results it gave me weren’t what I had expected…
Can anyone help?